Cr₂B, CrB and CrB₂ ceramics were prepared by hot-pressing of the powders synthesized via the solid state reactions between metallic chromium and amorphous boron powders. Cr₂B ceramics were prepared in the temperature range of 1200-1600°C. CrB ceramics were prepared in the temperature range of 1500-1900°C. CrB₂ ceramics were prepared in the temperature range of 1400-1900°C. It was observed that CrB₂ possesses more excellent sinterability than Cr₂B amd CrB. The hardness of CrB₂ ceramics increased with the sintering temperature up to 1700°C and then decreased owing to grain coarsening. As an excellent etching method of CrB₂ ceramics, the electrolytic etching method was developed.